Didcot and surrounding area infrastructure improvements

Reducing congestion and improving journey times, pedestrian and cycling connectivity and supporting new employment sites and housing.

Traffic Management notice

As part of our ongoing work, we need to implement traffic management measures to ensure the activity is carried out safely.

Collett roundabout, Didcot

Narrow lanes and lower speed limits remains in place at Collett Roundabout, allowing works to progress safely while maintaining traffic flow through the area.

Utility diversions

A number of utility providers are undertaking work to divert their service networks away from the area where we will be constructing the three sections of the scheme.

BT Openreach, Cloud HQ and Vodafone (telecoms) - end November 2026

There will be 2-way temporary traffic lights on the westbound lane of the A415 for a period of 5 weeks.

To reduce the impact on the network, all the temporary lights associated with the utility diversions are operational between the hours of 7am and 7pm, with a person operating the lights on manual control.

Public Rights of Way

These temporary closures are needed to facilitate drainage works, earthworks, and highway construction, and to ensure the safety of both the public and the workforce.

Clifton Hampden public right of way, March 2026 – September 2027

We have temporarily closed parts of footpaths 171/6/10 and 171/4/10 that lead to the west of the B4015 Oxford Road.

The closure will remain in place for approximately 18 months. A fully signed diversion route will be in place for the duration of the closure.

Appleford public rights of way, March 2026 – September 2027

We have temporarily closed and diverted the Appleford public right of way to the north of the B4016.

The closure will last approximately 18 months. A fully signed diversion route will be in place for the duration of the closure.

Thames Path, August 2026 – January 2028

We have temporarily closed parts of the Thames Path between Culham Lock and the weir, to the northwest of Long Wittenham.

The closure will remain in place for approximately 18 months. A fully signed diversion route will be in place for the duration of the closure.

About the improvements

The Didcot and surrounding areas major infrastructure scheme will provide vital transport infrastructure to reduce congestion and enable more reliable journey times, improve pedestrian and cycling connectivity, and support new employment sites and housing in and around Didcot.

The project includes four highway sections that incorporate improvements to existing roads, the construction of new roads, new walking and cycle routes, and will help to facilitate new and enhanced bus services.

Key benefits:

19km of walking and cycling paths to improve pedestrian and cycle connectivity for work and leisure trips
18 new bus stops to provide more sustainable travel options in and around Didcot
Reduce congestion and improve air quality in surrounding villages and parishes
Enable more jobs in the local area in new and existing employment sites
Support expected housing growth in the local area

Scheme benefits

Overview (pdf format, 564Kb)

Your questions answered

Frequently asked questions.

Take a look at a flyover of the scheme

Note: This video has only music audio.

What is happening when?

Construction work is underway on all sections of the scheme.

Project progress is communicated via our dedicated project newsletter. You can read previous copies:

Project Newsletter

Keep up to date with project progress by signing up for our dedicated project newsletter.

How it is being funded

Funding for the scheme comes from a combination of Homes England grant funding, Enterprise Oxfordshire capital investment, Section 106 contributions from developers and funds from the council's own capital budget.

Contact us

If you have any queries, please contact the delivery team.

Find out more about each element

Element 1: Widening of the A4130

The creation of a dual carriageway east of Milton Interchange with 1.6km of high quality and segregated walking and cycling facilities, linking to the future development at Valley Park and Didcot Science Bridge. Learn more about widening the A4130.

Element 2: Didcot Science Bridge

A new single-carriageway road bridge over the A4130, Great Western Main Line, and Milton Road, connecting to a new link road through the former Didcot A Power Station. The element connects with the Northern Perimeter north of Purchas Road roundabout. High-quality and segregated cycling and pedestrian facilities will be provided along the length of the scheme. Learn more about the Didcot Science Bridge.

Element 3: Didcot to Culham river crossing

A new single carriageway link road between the A4130 at Didcot and the A415 at Culham, with high quality and segregated walking and cycling facilities. It will include a new bridge over the Appleford Railway sidings and a new bridge over the River Thames. Learn more about the Didcot to Culham river crossing.

Element 4: Clifton Hampden bypass

A new single-carriageway link road between the A415 at Culham and the B4015 to the north of Clifton Hampden, with shared-use walking and cycling facilities. Learn more about the Clifton Hampden bypass.